oAuth example.

Follow link bellow and in Login page enter username: exo and password: exo,
    or username: root and password: exo. In first case you will be in role 'exo'
    in second in roles: 'exo' and 'admin'. Try access three services which annotated
    with JSR-250 annotation. Try Logout and Login again with different name/password.
    Read about protocol at http://oauth.net.